What is this black line in my eye?

I haven't had this since I was born. I have no other eye or vision problems. I do not know what this marking is and can't find anything like it anywhere else online. Its is a tiny black line along the edge of my iris.
Heres a pic: http://s12.photobucket.com/user/Rustbuff/media/Mobile%20Uploads/image_zpsgea94pca.jpg.html
Please help. What do you think this is?
Asked May 09, 2015

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